Systems and methods of delivering therapy using an ambulatory medical device

ABSTRACT

An ambulatory medical device capable of delivering therapy to a patient includes at least one response mechanism having a state capable of being activated by one response button; a controller operatively connected with the at least one response mechanism, the controller including at least one processor coupled with a memory; and a therapy manager component executable by the controller and configured to detect a physiological parameter having a value indicative of a health disorder of the patient, notify the patient of impending therapy delivery in response to the detection of the physiological parameter, monitor the state of each at least one response mechanism within at least one predetermined time period, and delay therapy delivery to the patient in response to detection of a change in the state in a single response mechanism of the at least one response mechanism within the at least one predetermined time period.

CROSS REFERENCE TO RELATED APPLICATIONS

This Application is a Continuation of U.S. patent application Ser. No.14/318,186, titled “SYSTEMS AND METHODS OF DELIVERING THERAPY USING ANAMBULATORY MEDICAL DEVICE,” filed on Jun. 27, 2014, which claimspriority under 35 U.S.C. § 119(e) to U.S. Provisional Application Ser.No. 61/840,787 titled “SYSTEMS AND METHODS OF DELIVERING THERAPY USINGAN AMBULATORY MEDICAL DEVICE,” filed Jun. 28, 2013, both of whichapplications are hereby incorporated herein by reference in theirentirety.

BACKGROUND

Technical Field

Aspects of the present invention relate to medical devices, and moreparticularly to apparatus and processes of delivering therapy using anambulatory medical device.

Discussion

Some ambulatory medical devices deliver therapy to patients. Forinstance, an ambulatory medical device may monitor a patient'selectrocardiogram (ECG) signal for indications of a cardiac abnormality.Where the ambulatory medical device identifies a cardiac abnormalitythat is treatable via the administration of a therapeutic shock, theambulatory medical device may initiate a treatment protocol. Whenexecuting a treatment protocol, the ambulatory medical device mustdetermine, with a high degree of accuracy, when it is appropriate todeliver therapy to the patient. The patient may, however, have the needto delay the administration of the therapy due to conditions that theambulatory medical device is not configured to detect.

SUMMARY

In accordance with at least one aspect of the embodiments disclosedherein, an ambulatory medical device is provided. The ambulatory medicaldevice accurately determines whether a patient requires a delay orprevention of the administration of therapy. In making thisdetermination, the ambulatory medical device executes a process that issensitive to and identifies potential false positives. For example, insome embodiments, the ambulatory medical device is configured toidentify a state of responsiveness of the patient (e.g., a patientcondition). Also, in some embodiments, the ambulatory medical device isconfigured to enable patients with poor dexterity or poor fine motorskills (including, but not limited to, patients with arthritis anddiabetes) to engage a delay of treatment through one or more responsemechanisms. The ambulatory medical device and the processes executedthereby may include audible and visual stimuli to a patient requestingthe patient perform one or more specific actions within a predeterminedamount of time to delay or prevent the administration of therapy.

According to an aspect, an ambulatory medical device capable ofdelivering therapy to a patient is provided. The ambulatory medicaldevice comprises at least one sensor configured to detect a healthdisorder of the patient, at least one treatment element configured todeliver therapy to the patient, at least one response mechanismconfigured to be actuated by the patient, the at least one responsemechanism having one of a first state and a second state, and at leastone controller operatively connected to the at least one sensor, the atleast one treatment element, and the at least one response mechanism.The at least one controller being configured to delay delivery of thetherapy to patient for a first predetermined period of time responsiveto detection of the health disorder and the at least one responsemechanism having the first state, and to deliver the therapy to thepatient in response to continued detection of the health disorder, theat least one response mechanism remaining in the first state, and a lackof responsiveness by the patient following expiration of thepredetermined period of time.

According to an aspect, an ambulatory medical device capable ofdelivering therapy to a patient is provided. The ambulatory medicaldevice comprises at least one response mechanism, the at least oneresponse mechanism having a state that is one of a first state and asecond state, a controller coupled with the at least one responsemechanism, the controller including at least one processor coupled witha memory, and a therapy management component. The therapy managementcomponent being executable by the controller and configured to detect atleast one physiological parameter having at least one value indicativeof a health disorder of the patient, request the patient change thestate of the at least one response mechanism from the first state to thesecond state in response to the detection of the at least onephysiological parameter, monitor the state of the at least one responsemechanism within a first predetermined period of time, delayadministration of therapy to the patient in response to detection of achange in the state of the at least one response mechanism from thefirst state to the second state within the first predetermined period oftime, monitor the state of the of the at least one response mechanismfor a second predetermined period of time, request the patient changethe state of the at least one response mechanism from the second stateto the first state in response to detection of the state of the at leastone response mechanism remaining in the second state for the secondpredetermined period of time, and one of further delay theadministration of therapy in response to detection of a change in thestate of the at least one response mechanism from the second state tothe first state, and prepare to deliver the therapy to the patient inresponse to the state of the at least one response mechanism notchanging from the second state to the first state following expirationof the second period of time.

According to an embodiment, the ambulatory medical device furthercomprises at least one therapy pad coupled with the controller, and atleast one ECG sensor coupled with the controller. According to anembodiment, the ambulatory medical device is further configured todeliver at least one defibrillating shock to the patient via the atleast one therapy pad and the therapy management component is configuredto delay the administration of therapy to the patient by delaying theadministration of the at least one defibrillating shock. According to anembodiment, the therapy management component is further configured todetect the at least one physiological parameter by monitoring a cardiacrhythm of the patient via the at least one ECG sensor. According to anembodiment, the therapy management component is further configured todetect the at least one physiological parameter having the at least onevalue indicative of the health disorder by detecting at least onephysiological parameter having at least one value indicative of at leastone of ventricular tachycardia, ventricular defibrillation, bradycardia,tachycardia, erratic heart rate, asystole, and pulseless electricalactivity. According to an embodiment, the therapy management componentis further configured to further delay the administration of therapy tothe patient by further delaying the administration of therapy for aduration that is greater for ventricular tachycardia than forventricular defibrillation.

According to an embodiment the ambulatory medical device includes adisplay coupled with the controller and the therapy management componentis further configured to display, via the display, at least onenotification requesting that the patient change the state of the atleast one response mechanism. According to an embodiment, the therapymanagement component is further configured to display, via the display,one or more notifications to the patient indicating a delay in theadministration of therapy to the patient.

According to an embodiment, the ambulatory medical device includes aspeaker coupled with the controller and the therapy management componentis further configured to request that the patient change the state inresponse to the detection of the at least one physiological parameter bygenerating audible alerts to the patient via the speaker. According toan embodiment, the therapy management component is further configured togenerate, via the speaker, audible alerts to the patient indicating adelay in the administration of therapy to the patient.

According to an embodiment, the therapy management component is furtherconfigured to monitor a state of consciousness of the patient. Accordingto an embodiment, the ambulatory medical device further includes anaccelerometer coupled with the controller and the therapy managementcomponent is configured to monitor the state of consciousness of thepatient by monitoring patient motion. According to an embodiment, thetherapy management component is further configured to delay theadministration of therapy in response to detection of targeted patientmotion. According to an embodiment, the therapy management component isfurther configured to administer therapy to the patient in response todetection of a patient fall.

According to an embodiment, the ambulatory medical device includes atactile stimulator coupled with the controller and the therapymanagement component is further configured to request the patient changethe state of the at least one response mechanism by vibrating theambulatory medical device controller via the tactile stimulator.

According to an embodiment, the therapy management component isconfigured to delay the administration of therapy to the patient inresponse to the detection of a change in the state of the at least oneresponse mechanism from the second state to the first state within thesecond period of time by delaying the administration of therapy aninterval of time selected based on a severity of the health disorder.According to an embodiment, the at least one response mechanism includesat least one response button. According to an embodiment, the firststate of the at least one response button includes a deactivated stateand the second state of the at least one response button includes anactivated state.

According to an aspect, a method of delivering therapy to a patientusing an ambulatory medical device is provided. The ambulatory medicaldevice includes a controller coupled with at least one responsemechanism, the at least one response mechanisms having a state that isone of a first state and a second state. The method comprises detecting,by the ambulatory medical device, at least one physiological parameterhaving at least one value indicative of a health disorder of thepatient, requesting the patient change the at least one responsemechanism from the first state to the second state in response todetecting the at least one physiological parameter, monitoring the stateof at least one response mechanism within a first predetermined periodof time, delaying administration of therapy to the patient in responseto detecting a change in the state of the at least one responsemechanism from the first state to the second state within the firstpredetermined period of time, monitoring the state of the at least oneresponse mechanism for a second predetermined period of time, requestingthe patient change the state of the at least one response mechanism fromthe second state to the first state in response to detecting the stateof the at least one response mechanism remaining in the second state forthe second predetermined period of time, and one of further delaying theadministration of therapy in response to detection of a change in thestate of the at least one response mechanism from the second state tothe first state, and preparing to deliver the therapy to the patient inresponse to the state of the at least one response mechanism notchanging from the second state to the first state following expirationof the second period of time.

According to an embodiment, the ambulatory medical device includes atleast one electrocardiogram (ECG) sensor coupled with the controller anddetecting, by the ambulatory medical device, the at least onephysiological parameter includes detecting an ECG signal. According toan embodiment, the ambulatory medical device is configured to deliver atleast one defibrillating shock to the patient via at least one therapypad coupled with the controller and delaying the administration oftherapy to the patient includes delaying the delivery of the at leastone defibrillating shock. According to an embodiment, detecting, by theambulatory medical device, the at least one physiological parameterincludes monitoring a cardiac rhythm of the patient via the at least oneECG sensor. According to an embodiment, detecting, by the ambulatorymedical device, the at least one physiological parameter having the atleast one value indicative of the health disorder includes detecting atleast one physiological parameter having at least one value indicativeof at least one of ventricular tachycardia, ventricular defibrillation,bradycardia, tachycardia, erratic heart rate, asystole, and pulselesselectrical activity.

According to an embodiment, the ambulatory medical device includes adisplay coupled with the controller and requesting that the patientchange the state of the at least one response mechanism from the firststate to the second state includes displaying at least one notificationto the patient via the display. According to an embodiment, delaying theadministration of therapy to the patient in response to detecting achange in the state of the at least one response mechanism from thefirst state to the second state includes displaying one or morenotifications to the patient via the display.

According to an embodiment, the ambulatory medical device includes aspeaker coupled with the controller and requesting that the patientchange the state of the at least one response mechanism from the firststate to the second state includes generating audible alerts to thepatient via the speaker. According to an embodiment, delaying theadministration of therapy to the patient in response to detecting achange from the first state to the second state includes generatingaudible alerts to the patient via the speaker.

According to an embodiment, the method further includes monitoring astate of consciousness of the patient. According to an embodiment, themethod further includes delaying the administration of therapy to thepatient in response to detecting a change in the state of the at leastone response mechanism from the first state to the second state withinthe first predetermined period of time and a conscious patient in thesecond predetermined period of time. According to an embodiment, theambulatory medical device further includes an accelerometer coupled withthe controller and monitoring the state of consciousness of the patientincludes monitoring patient motion. According to an embodiment, themethod further includes administering therapy to the patient in responseto detecting a patient fall.

According to an embodiment, the ambulatory medical device includes atactile stimulator coupled with the controller and requesting that thepatient change the state of the at least one response mechanism from thefirst state to the second state includes vibrating the ambulatorymedical device controller via the tactile stimulator.

According to an embodiment, delaying further the administration oftherapy to the patient in response to detecting a change in the state ofthe at least one response mechanism from the second state to the firststate includes delaying the administration of therapy for a timeinterval selected based on a severity of the health disorder.

According to an aspect, a non-transitory computer readable mediumstoring executable instructions configured to instruct at least onecontroller to perform a method of delivering therapy is provided. Themethod comprises detecting, by the ambulatory medical device, at leastone physiological parameter having at least one value indicative of ahealth disorder of the patient, requesting the patient change the atleast one response mechanism from the first state to the second state inresponse to detecting the at least one physiological parameter,monitoring the state of at least one response mechanism within a firstpredetermined period of time, delaying administration of therapy to thepatient in response to detecting a change in the state of the at leastone response mechanism from the first state to the second state withinthe first predetermined period of time, monitoring the state of the atleast one response mechanism for a second predetermined period of time,requesting the patient change the state of the at least one responsemechanism from the second state to the first state in response todetecting the state of the at least one response mechanism remaining inthe second state for the second predetermined period of time, and one offurther delaying the administration of therapy in response to detectionof a change in the state of the at least one response mechanism from thesecond state to the first state, and preparing to deliver the therapy tothe patient in response to the state of the at least one responsemechanism not changing from the second state to the first statefollowing expiration of the second period of time.

According to an aspect, an ambulatory medical device capable ofdelivering therapy to the patient and configurable between a pluralityof operation modes to delay administration of therapy is provided. Theambulatory medical device comprises two or more response mechanisms,each mechanism of the two or more response mechanisms having a status, amemory storing an active operation mode parameter identifying which ofthe plurality of operation modes is active, the plurality of operationmodes including a first operation mode requiring changes in a status ofone of the two or more response mechanisms, and the second operationmode requiring changes in a status of two of the two or more responsemechanisms, a controller coupled with the two or more responsemechanisms, the controller including at least one processor coupled withthe memory, and a therapy management component. The therapy managementcomponent being executable by the controller and configured to identifythe active operation mode from the plurality of operation modes, detectat least one physiological parameter having at least one valueindicative of a health disorder of the patient, request that the patientchange the status of one of the two or more response mechanisms inresponse to detection of the at least one physiological parameter andthe identification of the first mode as the active operation mode,monitor the status of the two or more response mechanisms within a firstpredetermined period of time, and delay administration of therapy to thepatient in response to detection of a first change in the status of oneof the two or more response mechanisms within the first predeterminedperiod of time and the identification of the first mode as the activeoperation mode.

According to an embodiment, the therapy management component is furtherconfigured to request, responsive to the detection the first change,that the patient change the status of one of the two or more responsemechanisms, and monitor the status of the one or more responsemechanisms within a second predetermined period of time, wherein thetherapy management component is configured to delay the administrationof therapy by delaying, responsive to the detection of the first changein the status within the first predetermined period of time and a secondchange in the status within the second predetermined period of time, theadministration of therapy to the patient. According to an embodiment,the ambulatory medical device further comprises at least one therapy padcoupled with the controller, and at least one ECG sensor coupled withthe controller. According to an embodiment, the ambulatory medicaldevice is configured to deliver at least one defibrillating shock to thepatient via the at least one therapy pad and the therapy managementcomponent is configured to delay in response to the detection of thefirst change in the status within the first predetermined period of timethe administration of therapy to the patient by delaying theadministration of the at least one defibrillating shock. According to anembodiment, the therapy management component is configured to detect theat least one physiological parameter by monitoring a cardiac rhythm ofthe patient via the at least one ECG sensor. According to an embodiment,the therapy management component is configured to detect the at leastone physiological parameter having the at least one value indicative ofthe health disorder by detecting at least one physiological parameterhaving at least one value indicative of at least one of ventriculartachycardia, ventricular defibrillation, bradycardia, tachycardia,erratic heart rate, asystole, and pulseless electrical activity.

According to an embodiment, the therapy management component isconfigured to delay the administration of therapy to the patient bydelaying the administration of therapy for a duration that is greaterfor ventricular tachycardia than for ventricular defibrillation.According to an embodiment, the ambulatory medical device includes adisplay coupled with the controller and the therapy management componentis further configured to display, via the display, at least onenotification requesting that the patient change the status. According toan embodiment, the therapy management component is further configured todisplay, via the display, one or more notifications to the patientindicating a delay in the administration of therapy to the patient.According to an embodiment, the ambulatory medical device includes aspeaker coupled with the controller and the therapy management componentis configured to request that the patient change the status in responseto the detection of the at least one physiological parameter bygenerating audible alerts to the patient via the speaker. According toan embodiment, the therapy management component is further configured togenerate, via the speaker, audible alerts to the patient indicating adelay in the administration of therapy to the patient.

According to an embodiment, the ambulatory medical device includes anaccelerometer coupled with the controller and the therapy managementcomponent is configured to detect the at least one physiologicalparameter by detecting patient motion via the accelerometer. Accordingto an embodiment, the therapy management component is further configuredto increase the first predetermined period of time responsive todetection of targeted patient motion. According to an embodiment, thetherapy management component is further configured to decrease the firstpredetermined period of time responsive to detection of a patient fall.According to an embodiment, the therapy management component isconfigured to delay the administration of therapy a first amount of timeand wherein the therapy management component is further configured todelay the administration of therapy a second amount of time responsiveto detecting targeted patient motion within the first predeterminedperiod of time.

According to an embodiment, the ambulatory medical device includes atactile stimulator coupled with the controller and the therapymanagement component is configured to request that the patient changethe status in response to the detection of the at least onephysiological parameter by vibrating the ambulatory medical devicecontroller via the tactile stimulator. According to an embodiment, thetherapy management component is configured to delay the administrationof therapy to the patient in response to the detection of the firstchange in the status within the first predetermined period of time bydelaying the administration for a time interval selected based on aseverity of the health disorder. According to an embodiment, the therapymanagement component is configured to request that the patient changethe status of at least two of the two or more response mechanisms inresponse to the detection of the at least one physiological parameterand the identification of the second mode as the operation mode.

According to an aspect, a method of delivering therapy to a patientusing an ambulatory medical device is provided. The ambulatory medicaldevice being configurable between a plurality of operation modes todelay administration of therapy, the ambulatory medical device includinga controller coupled with two or more response mechanisms, each responsemechanism of the two or more response mechanisms having a status. Themethod comprises identifying, by the ambulatory medical device, anactive operation mode from the plurality of operation modes, theplurality of operation modes including a first operation mode requiringchanges in a status of one of the two or more response mechanisms, and asecond operation mode requiring changes in a status of two of the two ormore response mechanisms, detecting, by the ambulatory medical device,at least one physiological parameter having at least one valueindicative of a health disorder of the patient, requesting that thepatient change the status of one of the two or more response mechanismsin response to detecting the at least one physiological parameter andidentifying the first mode as the active operation mode, monitoring thestatus of the two or more response mechanisms within a firstpredetermined period of time, and delaying administration of therapy tothe patient in response to detecting a first change in the status of oneof the one or more response mechanisms within the first predeterminedperiod of time and identifying the first mode as the active operationmode.

According to an embodiment, the method further includes requesting,responsive to detecting the first change, that the patient change thestatus of the one or more response mechanisms, and monitoring the statusof the one or more response mechanisms within a second predeterminedperiod of time, wherein delaying the administration of therapy to thepatient includes delaying, responsive to detecting the first change inthe status within the first predetermined period of time and a secondchange in the status within the second predetermined period of time, theadministration of therapy to the patient.

According to an embodiment, the ambulatory medical device includes atleast one electrocardiogram (ECG) sensor coupled with the controller anddetecting, by the ambulatory medical device, the at least onephysiological parameter includes detecting an ECG signal. According toan embodiment, the ambulatory medical device is configured to deliver atleast one defibrillating shock to the patient via at least one therapypad coupled with the controller and delaying the administration oftherapy to the patient in response to detecting the first change withinthe first predetermined period of time includes delaying the delivery ofthe at least one defibrillating shock. According to an embodiment,detecting, by the ambulatory medical device, the at least onephysiological parameter includes monitoring a cardiac rhythm of thepatient via the at least one ECG sensor. According to an embodiment,detecting, by the ambulatory medical device, the at least onephysiological parameter having the at least one value indicative of thehealth disorder includes detecting at least one physiological parameterhaving at least one value indicative of at least one of ventriculartachycardia, ventricular defibrillation, bradycardia, tachycardia,erratic heart rate, asystole, and pulseless electrical activity.According to an embodiment, the ambulatory medical device includes adisplay coupled with the controller and requesting that the patientchange the status of at least one of the one or more response mechanismsin response to detecting the at least one physiological parameterincludes displaying at least one notification to the patient via thedisplay. According to an embodiment, delaying the administration oftherapy to the patient in response to detecting the first change withinthe first predetermined period of time includes displaying one or morenotifications to the patient via the display.

According to an embodiment, the ambulatory medical device includes aspeaker coupled with the controller and requesting that the patientchange the status in response to detecting the at least onephysiological parameter includes generating audible alerts to thepatient via the speaker. According to an embodiment, delaying theadministration of therapy to the patient in response to detecting thefirst change within the first predetermined period of time includesgenerating audible alerts to the patient via the speaker. According toan embodiment, the ambulatory medical device includes an accelerometercoupled with the controller and detecting, by the ambulatory medicaldevice, the at least one physiological parameter further includesdetecting patient motion via the accelerometer. According to anembodiment, detecting the first change in the status within the firstpredetermined period of time includes increasing the first predeterminedperiod of time responsive to detecting targeted patient motion.According to an embodiment, detecting the first change in the statuswithin the first predetermined period of time includes decreasing thefirst predetermined period of time responsive to detecting a patientfall. According to an embodiment, delaying the administration of therapyincludes delaying the administration of therapy a first amount of timeand wherein the method further includes delaying the administration oftherapy to the patient a second amount of time responsive to detectingtargeted patient motion within the first predetermined period of time.

According to an embodiment, the ambulatory medical device includes atactile stimulator coupled with the controller and requesting that thepatient change the status in response to detecting the at least onephysiological parameter includes vibrating the ambulatory medical devicecontroller via the tactile stimulator. According to an embodiment,delaying, responsive to detecting the first change within the firstpredetermined period of time, the administration of therapy to thepatient includes delaying the administration of therapy for a timeinterval selected based on a severity of the health disorder. Accordingto an embodiment, the one or more response mechanisms include two ormore response mechanisms and the method further includes requesting thatthe patient change the status of at least two of the two or moreresponse mechanisms in response to detecting the at least onephysiological parameter and identifying the second mode as the activeoperation mode.

According to an aspect, a non-transitory computer readable mediumstoring executable instructions configured to instruct at least onecontroller to perform a method of delivering therapy is provided. Themethod comprises identifying, by the ambulatory medical device, anactive operation mode from the plurality of operation modes, theplurality of operation modes including a first operation mode requiringchanges in a status of one of the two or more response mechanisms, and asecond operation mode requiring changes in a status of two of the two ormore response mechanisms, detecting, by the ambulatory medical device,at least one physiological parameter having at least one valueindicative of a health disorder of the patient, requesting that thepatient change the status of one of the two or more response mechanismsin response to detecting the at least one physiological parameter andidentifying the first mode as the active operation mode, monitoring thestatus of the two or more response mechanisms within a firstpredetermined period of time, and delaying administration of therapy tothe patient in response to detecting a first change in the status of oneof the one or more response mechanisms within the first predeterminedperiod of time and identifying the first mode as the active operationmode.

Still other aspects, embodiments, and advantages of these exemplaryaspects and embodiments, are discussed in detail below. Moreover, it isto be understood that both the foregoing information and the followingdetailed description are merely illustrative examples of variousaspects, and are intended to provide an overview or framework forunderstanding the nature and character of the claimed subject matter.Any embodiment disclosed herein may be combined with any otherembodiment. References to “an embodiment,” “an example,” “someembodiments,” “some examples,” “an alternate embodiment,” “variousembodiments,” “one embodiment,” “at least one embodiment,” “this andother embodiments” or the like are not necessarily mutually exclusiveand are intended to indicate that a particular feature, structure, orcharacteristic described in connection with the embodiment may beincluded in at least one embodiment. The appearances of such termsherein are not necessarily all referring to the same embodiment. Inaddition, the accompanying drawings are included to provide illustrationand a further understanding of the various aspects and examples, and areincorporated in and constitute a part of this specification. Thedrawings, together with the remainder of the specification, serve toexplain principles and operations of the described and claimed aspectsand examples.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings are not intended to be drawn to scale. In thedrawings, components that are identical or nearly identical may berepresented by a like numeral. For purposes of clarity, not everycomponent is labeled in every drawing. In the drawings:

FIG. 1 is a functional schematic of one example of an ambulatory medicaldevice controller;

FIG. 2 is an illustration of one example of an ambulatory medicaldevice;

FIG. 3 is a flowchart of an example therapy delivery process;

FIG. 4 is a flowchart of an example process to determine patientcondition;

FIGS. 5A-D are timelines of example treatment sequences; and

FIGS. 6A-B are illustrations of one example of an ambulatory medicaldevice controller.

DETAILED DESCRIPTION

Some embodiments disclosed herein relate generally to the administrationof therapy to a patient using an ambulatory medical device. Theambulatory medical device may monitor any of a variety of physiologicalparameters to identify patient health disorders and provide therapyaccordingly. The patient may, however, require delay or prevention ofthe therapy. In an embodiment, an ambulatory medical device has aresponse mechanism including two response buttons that the patient maypush simultaneously to delay therapy. Requiring that a patient push bothresponse buttons simultaneously substantially reduces the likelihoodthat the patient accidentally activated the response buttons to delaytherapy, such as where the patient falls on the ground and activates asingle response button.

Patients with illnesses that cause fine motor skills to deteriorate,such as diabetes and arthritis, may find it challenging to depress bothresponse buttons simultaneously. Accordingly, in some embodiments, anambulatory medical device is provided that is configured to accuratelyidentify a state of patient responsiveness and delay therapy where inputis received that indicates the patient is responsive. Examples of suchinput include a change in the status of one or more of the responsemechanisms after issuance of a request to the patient to do so.

More specifically, in at least some embodiments, an ambulatory medicaldevice is configurable to operate in at least two modes. The first modemay require the patient to only activate and/or deactivate a singleresponse button. The first mode, however, may require a predefinedsequence of activations and/or deactivations within specific timeintervals to successfully delay the administration of therapy. Severalexamples of the predefined sequences performed in the first mode aredescribed further below in the Example Patient Monitoring and TreatmentScenarios in a First Operating Mode section and FIGS. 5A-5D. The secondmode may require the patient to activate two response buttons tosuccessfully delay treatment. Several examples of the predefinedsequences performed in the second mode are described further below inthe Example Patient Monitoring and Treatment Scenarios in a SecondOperating Mode section.

The examples of the methods and apparatus discussed herein are notlimited in application to the details of construction and thearrangement of components set forth in the following description orillustrated in the accompanying drawings. The methods and apparatusesare capable of implementation in other examples and of being practicedor of being carried out in various ways. Examples of specificimplementations are provided herein for illustrative purposes only andare not intended to be limiting. In particular, acts, elements andfeatures discussed in connection with any one or more examples are notintended to be excluded from a similar role in any other examples.

Also, the phraseology and terminology used herein is for the purpose ofdescription and should not be regarded as limiting. Any references toexamples or elements or acts of the systems and methods herein referredto in the singular may also embrace examples including a plurality ofthese elements, and any references in plural to any example or elementor act herein may also embrace examples including only a single element.References in the singular or plural form are not intended to limit thepresently disclosed systems or methods, their components, acts, orelements. The use herein of “including,” “comprising,” “having,”“containing,” “involving,” and variations thereof is meant to encompassthe items listed thereafter and equivalents thereof as well asadditional items. References to “or” may be construed as inclusive sothat any terms described using “or” may indicate any of a single, morethan one, and all of the described terms. In addition, in the event ofinconsistent usages of terms between this document and documentsincorporated herein by reference, the term usage in the incorporatedreferences is supplementary to that of this document; for irreconcilableinconsistencies, the term usage in this document controls.

Ambulatory Medical Device Controller

FIG. 1 illustrates an ambulatory medical device controller 100 that isconfigured to monitor a patient and the patient's environment for eventsof interest and to delivery therapy to the patient as necessary. Theambulatory medical device controller 100 may, for example, be configuredfor use in a wearable defibrillator. As shown in FIG. 1, the ambulatorymedical device controller 100 includes at least one processor 118, asensor interface 112, a therapy manager 114, a therapy deliveryinterface 102, data storage 104, a communication network interface 106,a user interface 108, and a battery 110. The data storage 104 includespatient data 116. Further, in this illustrated example, the battery 110is a rechargeable 3 cell 2200 mAh lithium ion battery pack that provideselectrical power to the other device components with a minimum 24 hourruntime between charges. It is appreciated that some or all of thecomponents described with regard to the ambulatory medical devicecontroller 100 may be located within or are integral to a protectivehousing of the ambulatory device medical controller 100, such as thehousing illustrated in FIGS. 6A and 6B.

According to the embodiment illustrated in FIG. 1, the processor 118 iscoupled with the sensor interface 112, the therapy delivery interface102, the data storage 104, the network interface 106, and the userinterface 108. The processor 118 performs a series of instructions thatresult in manipulated data which are stored in and retrieved from thedata storage 104. According to a variety of examples, the processor 118is a commercially available processor such as a processor manufacturedby Texas Instruments, Intel, AMD, Sun, IBM, Motorola, Freescale, and ARMHoldings. However, the processor 118 may be any type of processor,multiprocessor or controller, whether commercially available orspecially manufactured. For instance, according to one example, theprocessor 118 may include a power conserving processor arrangement suchas described in U.S. patent application Ser. No. 12/833,096, titled“SYSTEM AND METHOD FOR CONSERVING POWER IN A MEDICAL DEVICE,” filed Jul.9, 2010 (hereinafter the “'096 application”) (which issued as U.S. Pat.No. 8,904,214 on Dec. 2, 2014), which is hereby incorporated herein byreference in its entirety. In another example, the processor 118 is anIntel® PXA270.

In addition, in several embodiments the processor 118 is configured toexecute a conventional real-time operating system (RTOS), such asRTLinux. In these examples, the RTOS may provide platform services toapplication software, such as some examples of the therapy manager 114,which is discussed further below. These platform services may includeinter-process and network communication, file system management andstandard database manipulation. One or more of many operating systemsmay be used, and examples may not be limited to any particular operatingsystem or operating system characteristic. For instance, in someexamples, the processor 118 may be configured to execute a non-real timeoperating system, such as BSD or GNU/Linux.

In some embodiments, the therapy manager 114 is configured to monitor atleast one physiological parameter of a patient, detect health disorders,and administer therapy to the patient as necessary. Particular examplesof the processes performed by the therapy manager 114 are discussedfurther below with reference to FIGS. 3-5 and within the TherapyAdministration Processes section.

The therapy manager 114 may be implemented using hardware or acombination of hardware and software. For instance, in one example, thetherapy manager 114 is implemented as a software component that isstored within the data storage 112 and executed by the processor 118. Inthis example, the instructions included in the therapy manager 114program the processor 118 to monitor at least one physiologicalparameter of a patient, detect health disorders, and administer therapyto the patient as necessary. In other examples, therapy manager 114 maybe an application-specific integrated circuit (ASIC) that is coupledwith the processor 118 and tailored to monitor at least onephysiological parameter of a patient, detect health disorders, andadminister therapy to the patient as necessary. Thus, examples of thetherapy manager 114 are not limited to a particular hardware or softwareimplementation.

In some embodiments, the components disclosed herein, such as thetherapy manager 114, may read configuration parameters that affect thefunctions performed by the components. These configuration parametersmay be physically stored in any form of suitable memory includingvolatile memory, such as RAM, or nonvolatile memory, such as flashmemory or a magnetic hard drive. In addition, the configurationparameters may be logically stored in a propriety data structure, suchas a database or file defined by a user mode application, or in acommonly shared data structure, such as an application registry that isdefined by an operating system. In addition, some examples provide forboth system and user interfaces, as may be implemented using the userinterface 108, that allow external entities to modify the configurationparameters and thereby configure the behavior of the components.

The data storage 104 includes a computer readable and writeablenonvolatile data storage medium configured to store non-transitoryinstructions and data. In addition, the data storage 104 includesprocessor memory that stores data during operation of the processor 118.In some examples, the processor memory includes a relatively highperformance, volatile, random access memory such as dynamic randomaccess memory (DRAM), static memory (SRAM) or synchronous DRAM. However,the processor memory may include any device for storing data, such as anonvolatile memory, with sufficient throughput and storage capacity tosupport the functions described herein. According to several examples,the processor 118 causes data to be read from the nonvolatile datastorage medium into the processor memory prior to processing the data.In these examples, the processor 118 copies the data from the processormemory to the nonvolatile storage medium after processing is complete. Avariety of components may manage data movement between the nonvolatilestorage medium and the processor memory and examples are not limited toparticular data management components. Further, examples are not limitedto a particular memory, memory system, or data storage system.

The instructions stored on the data storage 104 may include executableprograms or other code that can be executed by the processor 118. Theinstructions may be persistently stored as encoded signals, and theinstructions may cause the processor 118 to perform the functionsdescribed herein. The data storage 104 also may include information thatis recorded, on or in, the medium, and this information may be processedby the processor 118 during execution of instructions. The medium may,for example, be optical disk, magnetic disk or flash memory, amongothers, and may be permanently affixed to, or removable from, theambulatory medical device controller 100.

In some embodiments, the patient data 116 includes data used by thetherapy manager 114 to monitor at least one physiological parameter of apatient, detect health disorders, and administer therapy to the patientas necessary. More particularly, according to the illustrated example,the patient data 116 includes information that identifies patient healthdisorder information and patient preferences. In an embodiment, theambulatory medical device controller 100 is configurable betweenmultiple modes of operation. The ambulatory medical device controller100 may be configured by trained personnel during a patient fitting andtraining process when the ambulatory medical device is first issued tothe patient. The patient may also reconfigure the ambulatory medicaldevice controller 100 in the field after the initial fitting andtraining process. The configuration and/or reconfiguration process mayinclude, for example, a specific activation sequence to change the modeof operation of the ambulatory medical device controller 100. Oneexample of a configuration process that may be used to change the modeof operation of the ambulatory medical device controller 100 in thefield is described within U.S. patent application Ser. No. 13/782,232,titled “SYSTEMS AND METHODS FOR CONFIGURING A WEARABLE MEDICALMONITORING AND/OR TREATMENT DEVICE,” filed Mar. 1, 2013, which is herebyincorporated herein by reference in its entirety.

In some embodiments, the ambulatory medical device controller 100 isconfigurable between two modes of operation. The first mode of operationallows the patient to delay the administration of therapy in response tochanging the status of one or more response buttons within one or morepredefined time intervals. The second mode of operation allows thepatient to delay the administration of therapy in response to thepatient changing the status of two or more response buttonssimultaneously. The first mode of operation may be suitable for patientswith poor dexterity or poor fine motor skills that find it difficult topush two or more response buttons simultaneously. Example treatmentsequences performed by the ambulatory medical device controller 100during operation in the first mode are described in the Example PatientMonitoring and Treatment Scenarios in a First Operating Mode section andFIGS. 5A-5D. The second mode of operation may allow the patient to delaythe administration of therapy in response to the patient changing thestatus of two or more response buttons. Example treatment sequencesperformed by the ambulatory medical device controller 100 duringoperation in the second mode are described in the Example PatientMonitoring and Treatment Scenarios in a Second Operating Mode section.

In an embodiment, the ambulatory medical device controller 100configures itself to operate in either the first or second mode ofoperation. For example, in some embodiments the ambulatory medicaldevice controller 100 may be configured to operate in the second mode ofoperation (i.e., requires two buttons to be pushed simultaneously todelay therapy) and detect that the patient cannot fully depress bothbuttons simultaneously via one or more pressure sensors in each button.The ambulatory medical device controller 100 may then configure itselfto operate in the first mode of operation (i.e., requires one button tobe pushed to delay therapy). In other embodiments, the ambulatory devicemay detect alternating button pushes or repeated single button pushesand configure itself to operation in the first mode. It is appreciatedthat the ambulatory medical device controller may also include aself-test procedure. The self-test procedure, for example, may includerequesting the patient to push both buttons and determine whether thefirst or second mode operation is appropriate for the particularpatient.

It is appreciated that the first and second modes of operation may beapplied to other ambulatory medical device controller operations outsideof the delay of therapy administration. For example, power up selftests, health parameter recording (e.g., ECG), or any other activity mayrequire the activation of one or more response buttons in the first modewhile requiring the activation of two or more response buttonssimultaneously in the second mode.

As illustrated in FIG. 1, the therapy manager 114 and the patient data116 are separate components. However, in other examples, the therapymanager 114 and the patient data 116 may be combined into a singlecomponent or re-organized so that a portion of the data included in thetherapy manager 114, such as executable code that causes the processor118 to monitor at least one physiological parameter of a patient, detecthealth disorders, and administer therapy to the patient as necessary,resides in the patient data 116, or vice versa. Such variations in theseand the other components illustrated in FIG. 1 are intended to be withinthe scope of the embodiments disclosed herein.

The patient data 116 may be stored in any logical construction capableof storing information on a computer readable medium including, amongother structures, flat files, indexed files, hierarchical databases,relational databases or object oriented databases. These data structuresmay be specifically configured to conserve storage space or increasedata exchange performance. In addition, various examples organize thepatient data 116 into particularized and, in some cases, uniquestructures to perform the functions disclosed herein. In these examples,the data structures are sized and arranged to store values forparticular types of data, such as integers, floating point numbers,character strings, arrays, linked lists, and the like.

As shown in FIG. 1, the ambulatory medical device controller 100includes several system interface components 102, 106, and 112. Each ofthese system interface components is configured to exchange, i.e. sendor receive, data with one or more specialized devices that may belocated within the housing of the ambulatory medical device controller100 or elsewhere. The interfaces 102, 106, and 112 may include hardwarecomponents, software components or a combination of both. Within eachinterface, these components physically and logically couple theambulatory medical device controller 100 to the specialized devices.This physical and logical coupling enables the ambulatory medical devicecontroller 100 to both communicate with and, in some instances, power orcontrol the operation of the specialized devices. These specializeddevices may include physiological sensors, therapy delivery devices, andcomputer networking devices. It is appreciated that the sensor interface112 and the therapy delivery interface 102 may be combined to form asingle sensor and therapy delivery interface.

According to various examples, the hardware and software components ofthe interfaces 102, 106 and 112 implement a variety of coupling andcommunication techniques. In some examples, the interfaces 102, 106, and112 use leads, cables or other wired connectors as conduits to exchangedata between the ambulatory medical device controller 100 andspecialized devices. In other examples, the interfaces 102, 106, and 112communicate with specialized devices using wireless technologies such asradio frequency or infrared technology. The software components includedin the interfaces 102, 106, and 112 enable the processor 118 tocommunicate with specialized devices. These software components mayinclude elements such as objects, executable code, and populated datastructures. Together, these software components provide softwareinterfaces through which the processor 118 can exchange information withspecialized devices. Moreover, in at least some examples where one ormore specialized devices communicate using analog signals, theinterfaces 102, 106, and 112 further include components configured toconvert analog information into digital information, and vice-versa, toenable the processor 118 to communicate with specialized devices.

As discussed above, the system interface components 102, 106, and 112shown in the example of FIG. 1 support different types of specializeddevices. For instance, the components of the sensor interface 112 couplethe processor 118 to one or more physiological sensors such as a bodytemperature sensors, respiration monitors, acoustic sensors, and ECGelectrodes (e.g., dry capacitive ECG electrodes), one or moreenvironmental sensors such as atmospheric thermometers, airflow sensors,video sensors, audio sensors, accelerometers, GPS locators, andhygrometers. In these examples, the sensors may include sensors with arelatively low sampling rate, such as wireless sensors. An exampleacoustic sensor is described in co-pending U.S. patent application Ser.No. 14/314,799, titled “THERAPEUTIC DEVICE INCLUDING ACOUSTIC SENSOR,”filed Jun. 25, 2014, which is hereby incorporated herein by reference inits entirety.

The components of the therapy delivery interface 102 couple one or moretherapy delivery devices, such as capacitors and defibrillatorelectrodes, to the processor 118. In addition, the components of thenetwork interface 106 couple the processor 118 to a computer network viaa networking device, such as a bridge, router or hub. According to avariety of examples, the network interface 106 supports a variety ofstandards and protocols, examples of which include USB (via, forexample, a dongle to a computer), TCP/IP, Ethernet, Wireless Ethernet,IEEE 802.15.4j, BLUETOOTH, ZigBee, M-Bus, CAN-bus, IP, IPV6, UDP, DTN,HTTP, FTP, SNMP, CDMA, NMEA and GSM. To ensure data transfer is secure,in some examples, the ambulatory medical device controller 100 cantransmit data via the network interface 106 using a variety of securitymeasures including, for example, TLS, SSL or VPN. In other examples, thenetwork interface 106 includes both a physical interface configured forwireless communication and a physical interface configured for wiredcommunication. According to various embodiments, the network interface106 enables communication between the ambulatory medical devicecontroller 100 and a variety of personal electronic devices includingcomputer enabled glasses and earpieces.

Thus, the various system interfaces incorporated in the ambulatorymedical device controller 100 allow the device to interoperate with awide variety of devices in various contexts. For instance, some examplesof the ambulatory medical device controller 100 are configured toperform a process of sending critical events and data to a centralizedserver via the network interface 106. An illustration of a process inaccord with these examples is disclosed in U.S. Pat. No. 6,681,003,titled “DATA COLLECTION AND SYSTEM MANAGEMENT FOR PATIENT-WORN MEDICALDEVICES,” issued on Jan. 20, 2004, which is hereby incorporated hereinby reference in its entirety.

As illustrated in FIG. 1, the therapy delivery interface 102 and thenetwork interface 106 are optional and may not be included in everyexample. For instance, a heart rate monitor may employ the ambulatorymedical device controller 100 to issue alarms but may not include atherapy delivery interface 102 to treat cardiac abnormalities.Similarly, an ambulatory defibrillator may include the ambulatorymedical device controller 100 to provide alarm functionality but may notinclude a network interface 106 where, for example, the ambulatorydefibrillator is designed to rely on the user interface 108 to announcealarms.

The user interface 108 shown in FIG. 1 includes a combination ofhardware and software components that allow the ambulatory medicaldevice controller 100 to communicate with an external entity, such as apatient or other user. These components may be configured to receiveinformation from actions such as physical movement, verbal intonation orthought processes. In addition, the components of the user interface 108can provide information to external entities. Examples of the componentsthat may be employed within the user interface 108 include keyboards,mouse devices, trackballs, microphones, electrodes, touch screens,printing devices, display screens and speakers. In some examples, theelectrodes include an illuminating element, such as an LED. In otherexamples, the printing devices include printers capable of renderingvisual or tactile (Braille) output. It is appreciated that the userinterface components described herein may be coupled with the userinterface 108 of the ambulatory medical device controller 100 orincluded in the housing of the ambulatory medical device controller.

The ambulatory medical device controller 100 has a variety of potentialapplications and is well suited to devices that notify external entitiesof a variety of events, some of which require a predetermined responsefrom the external entity. Predetermined responses may include anyresponse that is appropriate given the event being reported.Predetermined responses may include acknowledgment of the alarm, entryof information indicating that the alarm is being addressed andrectification of the event or condition that triggered the alarm.Examples of devices to which the ambulatory medical device controller100 is well suited include critical care medical devices, such as anambulatory external defibrillator.

Example Ambulatory Medical Device

In an embodiment, the ambulatory medical device is a wearabledefibrillator that consists of a garment (e.g., a vest and/or belt) thatis worn by the patient. The wearable defibrillator monitors thepatient's ECG with sensing electrodes, detects life-threateningarrhythmias, and delivers a cardioverting or defibrillating shockthrough therapy electrodes if treatment is necessary. FIG. 2 illustratesa wearable defibrillator, such as a LifeVest® wearable cardioverterdefibrillator available from ZOLL Medical Corporation of Chelmsford,Mass. As shown, the wearable defibrillator 200 includes a harness 210having a pair of shoulder straps and a belt that is worn about the torsoof a patient. The wearable defibrillator 200 includes a plurality of ECGsensing electrodes 212 that are attached to the harness 210 at variouspositions about the patient's body and electrically coupled with thesensor interface 112 of the ambulatory medical device controller 100 viaa connection pod 230. The plurality of ECG sensing electrodes 212, whichmay be dry-sensing capacitance electrodes, long term wear adhesiveelectrodes, or conventional adhesive electrodes, are coupled with theambulatory medical device controller 100 to monitor the cardiac functionof the patient and generally include a front/back pair of ECG sensingelectrodes and a side/side pair of ECG sensing electrodes. AdditionalECG sensing electrodes may be provided, and the plurality of ECG sensingelectrodes 212 may be disposed at varying locations about the patient'sbody.

The wearable defibrillator 200 also includes a plurality of therapyelectrodes 214 that are electrically coupled with the therapy deliveryinterface 102 of the ambulatory medical device controller 100 via theconnection pod 230 and which are configured to deliver one or moretherapeutic defibrillating shocks to the body of the patient, if it isdetermined that such treatment is warranted. The connection pod 230electrically couples the plurality of ECG sensing electrodes 212 and theplurality of therapy electrodes 214 to the sensor interface 112 and thetherapy delivery interface 102, respectively, of the ambulatory medicaldevice controller 100, and may include electronic circuitry. Theconnection pod 230 may also include other electronic circuitry, such asa motion sensor or accelerometer through which patient activity may bemonitored.

As shown in FIG. 2, the wearable defibrillator 200 also includes a userinterface pod 240 that is electrically coupled with, or integrated with,the user interface 108 of the ambulatory medical device controller 100.The user interface pod 240 can be attached to the patient's clothing orto the harness 210, for example, via a clip (not shown) that is attachedto a portion of the interface pod 240. Alternatively, the user interfacepod 240 may simply be held in a person's hand. In some embodiments, theuser interface pod 240 may communicate wirelessly with the userinterface 108 of the ambulatory medical device controller 100, forexample, using a BLUETOOTH, Wireless USB, ZigBee, Wireless Ethernet,GSM, or other type of communication interface. The user interface pod240 typically includes a number of buttons by which the patient, or abystander can communicate with the ambulatory medical device controller100, and a speaker by which the ambulatory medical device controller 100may communicate with the patient or the bystander. In one example, theinterface pod has two response buttons that the patient may communicatewith the ambulatory medical device controller 100 to delay theadministration of therapy.

In another example, the functionality of the user interface pod 240 isintegrated into the housing of the ambulatory medical device controller100. FIGS. 6A-B illustrate such an example of the ambulatory medicaldevice controller 100. The ambulatory medical device controller 100includes a tactile response mechanism comprising two response buttons610 on opposing sides of the housing of the ambulatory medical devicecontroller 100. As shown in FIGS. 6A-B, the response buttons 610 arerecessed below a plane of an outer surface of the housing to reduce thelikelihood of accidental activation (e.g., a patient falling on andactuating the response button). The ambulatory medical device controller100 also includes, in this example, a display screen 620 to enable thecommunication of visual stimuli to the patient. In addition, the displayscreen 620 may also incorporate a touch screen to enable the patient tointeract with the ambulatory medical device controller 100. It isappreciated that the response buttons 610 do not have to be placed onopposing sides of the housing as illustrated in FIGS. 6A-B. The responsebuttons, for example, may be located adjacent to each other in thehousing of the ambulatory medical device controller. The adjacentplacement of the response buttons may make it easier for individualswith smaller hands or less dexterity to engage the response buttons.

Where the ambulatory medical device controller 100 determines that thepatient is experiencing cardiac arrhythmia, the ambulatory medicaldevice controller 100 may issue an audible alarm via a speaker and/ordisplay a notification via the display screen 620 on the ambulatorymedical device controller 100, or the user interface pod 240, alertingthe patient and any bystanders to the patient's medical condition. Theambulatory medical device controller 100 may also instruct the patientto press and hold one or more response buttons 610 on the ambulatorymedical device controller 100, or on the user interface pod 240, toindicate that the patient is conscious, thereby instructing theambulatory medical device controller 100 to withhold the delivery of oneor more therapeutic defibrillating shocks. If the patient does notrespond, the device may presume that the patient is unconscious, andproceed with the treatment sequence, culminating in the delivery of oneor more defibrillating shocks to the body of the patient.

It is appreciated that the response mechanism employed by the ambulatorymedical device controller may not be limited to two response buttons.For example, the response mechanism of the ambulatory medical devicecontroller 100 may incorporate one or more microphones to enable theambulatory medical device controller 100 to receive voice commands fromthe patient. In this example, the ambulatory medical device controller100 may request that the patient say a specific phrase to delay theadministration of therapy.

Therapy Administration Processes

Various embodiments implement and enable processes through which anambulatory medical device controller, such as the ambulatory medicaldevice controller 100 described above with reference to FIG. 1,administers therapy to a patient. FIG. 3 illustrates one such process300 that includes acts of detecting a health disorder 302, determiningpatient condition 304, and administering therapy 306.

In the act 302, the ambulatory medical device controller detects ahealth disorder of the patient. In an embodiment, the act 302 includesmonitoring at least one physiological parameter of the patient having atleast one value potentially indicative of a health disorder. Forexample, the ambulatory medical device controller may monitor a cardiacrhythm of the patient and detect one or more heart arrhythmia healthdisorders. Specific examples of detectable heart arrhythmia healthdisorders include, but are not limited to, premature ventricularcontraction, ventricular defibrillation, bradycardia, tachycardia (e.g.,ventricular tachycardia, supraventricular tachycardia, and sinustachycardia), an erratic heart rate with no discernible sinus rhythm,asystole, or pulseless electrical activity. The ambulatory medicaldevice controller may use any of a variety of methods to detect healthdisorders. In one example, the ambulatory medical device controllerstores information regarding normal readings of the physiologicalparameter. In this example, the ambulatory medical device controllerincludes signal processing capabilities and matches the incomingreadings with the stored known normal patient readings that characterizethe patient's normal cardiac function. The matching process could beimplemented in a variety of methods including a matched filteringprocess. An example system and method for detecting health disordersrelating to cardiac arrhythmias is described in U.S. patent applicationSer. No. 13/428,329, titled “SELECTION OF OPTIMAL CHANNEL FOR RATEDETERMINATION,” filed Mar. 23, 2013 (which issued as U.S. Pat. No.8,897,860 on Nov. 25, 2014), which is hereby incorporated herein byreference in its entirety. Another example system and method fordetecting health disorders relating to cardiac arrhythmias is describedin U.S. Pat. No. 8,706,215, titled “WEARABLE AMBULATORY MEDICAL DEVICEWITH MULTIPLE SENSING ELECTRODES,” issued Apr. 22, 2014, which is herebyincorporated herein by reference in its entirety.

In the act 304, the ambulatory medical device controller determines apatient condition. Determining the patient condition may includeidentifying a state of responsiveness of the patient. Actions performedby the ambulatory medical device controller during execution of the act304 are described further below with reference to FIG. 4.

In the act 306, the ambulatory medical device controller administerstherapy to the patient. In some examples where the ambulatory medicaldevice controller is coupled with one or more therapy electrodes, theambulatory medical device controller delivers one or more therapeuticshocks to the patient. After the act 306, the ambulatory medical devicecontroller terminates the process 300. It is appreciated that theambulatory medical device controller may execute the process 300 againif the initial administration of therapy did not resolve all of thehealth disorders of the patient.

As discussed above with regard to the act 304 in FIG. 3, variousembodiments implement processes for determining patient condition (e.g.,identifying a state of responsiveness of the patient). FIG. 4illustrates one such process 400 that implements the act 304 and thatincludes acts of notifying the patient of a health disorder 402,requesting a response from the patient 404, determining whether theresponse was received 406, and delaying therapy if the response wasreceived 408.

In the act 402, the ambulatory medical device controller notifies thepatient of the health disorder. In one example, the ambulatory medicaldevice controller, through the user interface 108, displays a patientnotification on a display screen, transmits an audible alert via aspeaker to the patient or both. The audible alert may include a siren orspecific alerts stated by a voice that notify the patient audibly. Inother examples, a tactile stimulator is housed in or coupled with theambulatory medical device controller to notify the patient. The tactilestimulator may include a motor with an unbalanced weight on its shaft.When the motor is on, it causes the belt to vibrate much like acell-phone in vibration mode. It is appreciated that the tactilestimulator may be activated by the ambulatory medical device controllerduring any patient notification, alert, or siren.

In the act 404, the ambulatory medical device controller requests atargeted response from the patient. The response from the patient isreceived by a response mechanism of the ambulatory medical devicecontroller. In an embodiment, the response mechanism comprises tworesponse buttons coupled with or integrated with the ambulatory medicaldevice. The patient may communicate with the ambulatory medical devicecontroller through activating or deactivating one or both of theresponse buttons. In the act 404, the ambulatory medical devicecontroller requests that the patient change the status of one responsebutton (e.g., change the response button from a deactivated state to anactivated state or vice-versa) within a predetermined amount of time. Ifthe patient successfully performs the requested response, the ambulatorymedical device may request that the patient again change the status ofthe same response button within another predetermined amount of time.Such sequences of requests and responses may be repeated one or moretimes to ensure the patient does not require treatment.

It is appreciated that a change in status of both response buttons maybe recorded by the medical device controller as a successful patientresponse. In other embodiments, the ambulatory medical device controllermay require any number of response button changes prior to recording asuccessful patient response and delaying the administration of therapyto the patient. It is also appreciated that the ambulatory medicaldevice controller may include any number of response buttons and mayrequest that the patient push any combination of response buttons todelay the administration of therapy.

In another embodiment, the response mechanism includes a touch screencoupled with or integrated with the ambulatory medical devicecontroller. The patient communicates with the ambulatory medical devicecontroller by interacting with the touch screen. For example, thepatient may press a button displayed on the touch screen of theambulatory medical device. If the patient successfully touches thebutton on the touch screen, the ambulatory medical device may relocatethe button on the touch screen and request that the patient press therelocated button on the touch screen again.

In other embodiments, the response mechanism includes patient voicerecognition through one or more microphones coupled with or integratedwith the ambulatory medical device controller. For example, in oneembodiment, the ambulatory medical device controller may request thepatient say a specific phrase to the ambulatory medical devicecontroller.

In the act 406, the ambulatory medical device controller determineswhether the requested action was performed. In an embodiment, theambulatory medical device controller notifies the patient thatadministration of the therapy will be delayed or canceled when thepatient successfully performs the requested action in two instances insuccession. This notification may include any combination of audible,visual, and tactile output. In some embodiments, the ambulatory medicaldevice controller determines whether the administration of the therapyis delayed or canceled based on a value of a predefined configurationparameter.

In another embodiment, the act 406 further includes reading one or moreaccelerometers communicatively connected to or integrated with theambulatory medical device controller. The readings from the one or moreaccelerometers may be used to determine a state of consciousness of thepatient through the detection of targeted patient activity. Theambulatory medical device controller may delay the administration oftherapy responsive to detecting a conscious patient (e.g., detectingtargeted patient activity). For example, the accelerometers may detectthat the patient is walking and delay the administration of therapy.This delay of the administration of therapy responsive to patientactivity may be independent of the requested action (e.g., change thestatus of a response button) or, where the patient responds with therequested action, may further increase the delay that would haveresulted from the patient solely successfully performing the requestedaction. It is appreciated that the accelerometer may be employed by theambulatory medical device controller to detect a patient fall andshorten delays and/or administer therapy to the patient responsive tothe detected patient fall. In addition, other sensors may be used todetermine the state of consciousness of the patient including, but notlimited to, a microphone to detect patient speech, an acoustic sensor todetect viable respiration, and two or more response mechanisms thatrequire patient activation (e.g., in the second mode of operationdescribed herein).

As described above, in some embodiments, one or more response buttonsare coupled with or integrated in the ambulatory medical devicecontroller. In these embodiments, the ambulatory medical devicecontroller monitors the status of the response buttons within the act406. The ambulatory medical device controller may ignore a specificresponse button in the event that the button remains in an activatedstate for a period of time longer than a predetermined duration (e.g.,the button is jammed where, for example, the patient has fallen on thecontroller in a manner in which the button is held in an activatedstate).

In another embodiment, the ambulatory medical device controller isconfigured to determine whether any actions requested and performed areperformed by the patient. The ambulatory medical device may make thisdetermination with reference to a body marker transmitted through thepatient from the response button to electrodes on the patient such asdescribed in U.S. Pat. No. 8,271,082, titled “MEDICAL DEVICE CONFIGUREDTO TEST FOR USER RESPONSIVENESS,” issued on Sep. 18, 2012, which ishereby incorporated herein by reference in its entirety. In embodimentswhere the patient is requested to audibly reply to the ambulatorymedical device controller, patient voice recognition may be employed asdescribed in U.S. Pat. No. 8,369,944 titled “WEARABLE DEFIBRILLATOR WITHAUDIO INPUT/OUTPUT,” issued on Feb. 5, 2013, which is herebyincorporated herein by reference in its entirety.

After the therapy has been delayed in the act 408, the ambulatorymedical device controller repeats the act 404 to ensure the patientremains conscious. A specific length of the delay may be selectedresponsive to the severity of the health disorder. In an embodiment, theambulatory medical device controller monitors the cardiac rhythm of apatient to detect arrhythmias. The ambulatory medical device controllermay detect, for example, ventricular tachycardia and set the delay to 30seconds. When the ambulatory medical device controller detects a healthdisorder that is more severe, for example ventricular fibrillation, theambulatory medical device controller may shorten the delay to 15seconds. It is appreciated that the cycle of requesting a specificaction from the patient and delaying therapy accordingly may be limitedto a finite number of cycles before automatically delivering therapy.Referring back to the act 406, the ambulatory medical device controllerwill proceed to complete the process 400 if the patient does not respondas required or has successfully delayed therapy up to a maximumpredetermined amount of time. It is also appreciated that the ambulatorymedical device controller may terminate the process 300 or the process400 when the ambulatory medical device controller ceases to detect ahealth disorder of the patient for a predetermined period of time.

Each of the processes disclosed herein depicts one particular sequenceof acts in a particular example. The acts included in each of theseprocesses may be performed by, or using, a medical device speciallyconfigured as discussed herein. Some acts are optional and, as such, maybe omitted in accord with one or more examples. Additionally, the orderof acts can be altered, or other acts can be added, without departingfrom the scope of the systems and methods discussed herein. In addition,as discussed above, in at least one example, the acts are performed on aparticular, specially configured machine, namely an ambulatory medicaldevice controller configured to operate in one or more modes ofoperation according to the examples disclosed herein.

Example Patient Monitoring and Treatment Scenarios in a First OperatingMode

Various embodiments implement and enable various scenarios through whichan ambulatory medical device controller operating in a first operatingmode, such as the ambulatory medical device controller 100 describedabove with reference to FIG. 1, administers therapy to a patient. Insome embodiments, the first mode of operation allows the patient todelay the administration of therapy in response to changing the statusof one or more response buttons within one or more predefined timeintervals. FIGS. 5A-D illustrate timelines of example treatmentsequences for the administration of therapy (e.g., a defibrillatingshock) to a patient by the ambulatory medical device controller whileoperating in a first operation mode. These treatment sequences include acardiac rhythm monitoring sequence 502 with cardiac rhythm detectionactivities 516A-D, a arrhythmia declaration sequence 504 with arrhythmiadeclaration activities 518A-D, a response button sequence 506 withresponse button activities 520A-D, a screen sequence 508 with patientnotification activities 522A-C, an audio and tactile sequence 510 with avibrate activity 524, a siren activity 526, and alert activities 528A-D,a converter sequence 512 with a converter on activity 530, a converteroff activity 532, an apply gel activity 534, and a transmit pulseactivity 536, and an elapsed time sequence 514.

In a scenario 500A illustrated in FIG. 5A, the cardiac rhythm of apatient is continuously monitored in an activity 516A as seen on thecardiac rhythm sequence 502. The ambulatory medical device controllerdetects a cardiac arrhythmia event 518A seen on the arrhythmiadeclaration sequence 504. The ambulatory medical device controllersubsequently displays a patient notification during patient notificationactivity 522A on the screen sequence 508. The patient notification maydisplay text, for example, stating “Patient Respond.” During thispatient notification, the ambulatory medical device controller vibratesduring vibrate activity 524 on the audio and tactile sequence 510. Thevibrate activity 524 (e.g., vibrating the ambulatory medical devicecontroller and/or a tactile stimulator disposed in the connection pad230) and the display patient notification activity 522A are followed bysirens during siren activity 526 on the audio and tactile sequence 510.While the ambulatory medical device controller is alerting the patientthrough sirens, the converter turns on during converter on activity 530on the converter sequence 512 in preparation for the administration of atherapeutic shock to the patient. Turning the converter on may enable acapacitor bank configured to deliver a large amount of energy to thepatient through a therapeutic shock to charge from a battery source inthe ambulatory medical device controller.

An audible alert activity 528A is then communicated to the patient andis followed by a siren activity 526 as shown on the audio and tactilesequence 510. For example, the ambulatory medical device controller maystate “press response button to delay treatment” in the event that theresponse button's initial state is deactivated as shown in responsebutton activity 520A on the response button sequence 506. The patientthen responds accordingly to the patient notification activity 522A andthe audible alert activity 528A and pushes the response button at thezero second mark on the elapsed time sequence. The converter is turnedoff during a converter off activity 532 as shown on the convertersequence 512 shortly after the zero second mark. In response to thepatient's response and turning off the converter, the ambulatory medicaldevice controller proceeds to notify the patient at the zero second markthrough the patient notification activity 522B and the correspondingalert activity 528B that the patient has successfully completed therequested response. The patient notification activity 522B may display“treatment being delayed” and the audible alert activity 528B may recite“treatment has been delayed, bystanders do not interfere.” The delayproceeds for approximately 25 seconds punctuated by the repeated audiblealert activities 528B to the patient because the response button remainsin an active state.

After about 25 seconds (i.e., at or about the 25 second mark of theelapsed time sequence 514), the ambulatory medical device controllerrequests an additional action be performed by the patient to verifypatient responsiveness. The ambulatory medical device controller issuesa patient notification during the patient notification activity 522C andmay display “please let go of response button” as shown on the screensequence 508. This notification is accompanied by siren activity 526followed by an alert activity 528C that may state “please let go ofresponse button” as shown on the audio and tactile sequence 510. Theambulatory medical device controller then turns on the converter inconverter on activity 530 shortly after the 30 second mark of theelapsed time sequence 514 to ready the ambulatory medical devicecontroller to deliver a therapeutic shock. The audible alert activities528C and siren activities 526 continue until shortly after the 45 secondmark on the elapsed time sequence 514 where gel is applied during theapply gel activity 534 on the converter sequence 512. The gel may beapplied from therapy electrodes coupled with the ambulatory medicaldevice controller to improve the transfer of energy from the therapyelectrodes to the patient during the administration of the therapeuticshock. The ambulatory medical device controller proceeds to issue anaudible alert during an alert activity 528D that may state “bystanders,do not touch patient” as shown on the audio and tactile sequence 510.The ambulatory medical device controller proceeds to transmit adefibrillating pulse of energy during the transmit pulse activity 536 asshown on the converter sequence 512 at the 55 second mark on the elapsedtime sequence 514. It is appreciated that a second pulse may betransmitted if the arrhythmia continues and the patient fails to respondto additional requests from the ambulatory medical device controller.

In scenario 500B of FIG. 5B, the cardiac rhythm of a patient iscontinuously monitored in an activity 516B and a cardiac arrhythmiaevent 518B occurs similar to scenario 500A as described above withregard to FIG. 5A. The ambulatory medical device controller executes thesame initial process of issuing a patient notification 522A, an audiblealert activity 528A, a vibrate activity 524, and a siren activity 526prior to requesting the patient to push the response button in a patientnotification activity 522B and an alert activity 528B. The ambulatorymedical device controller delays the administration of therapy inresponse to the requested action (e.g., pushing the response button)being successfully completed by the patient. Next, the ambulatory devicecontroller requests that the patient release the response button via apatient notification activity 522C and an alert activity 528C betweenthe 25 and 30 second marks on the elapsed time sequence 514. At aboutthe 35 second mark of the elapsed time sequence 514, the patientreleases the response button and subsequently activates the responsebutton as shown in a response button activity 520B on the responsebutton sequence 506. The ambulatory medical device controllersubsequently notifies the patient that the response was successfullyperformed as shown through a patient notification activity 522B and analert activity 528B shortly after the 35 second mark of the elapsed timesequence 514. The ambulatory medical device controller proceeds to delay25 seconds (i.e., until the 60 second mark on the elapsed time sequence514) prior to asking the patient to release the response button througha patient notification activity 522C and a corresponding alert activity528C. In this scenario, however, the response button is not released asshown in the responsive button activity 520B of the response buttonsequence. The patient may have fallen unconscious and accidentallyfallen on the response button. The ambulatory medical device controlleraccordingly administers therapy using the same sequence as describedwith regard to scenario 500A but between the 65 and 95 second marks onthe elapsed sequence 514 of FIG. 5B. It is appreciated that a secondpulse may be transmitted if the arrhythmia continues and the patientfails to respond to additional requests from the ambulatory medicaldevice controller.

In scenario 500C of FIG. 5C, the cardiac rhythm of a patient ismonitored in an activity 516C and a cardiac arrhythmia event 518C occurssimilar to scenario 500A as described above with regard to FIG. 5A. Theambulatory medical device controller executes the same initial processof issuing a patient notification activity 522A, an audible alertactivity 528A, a vibrate activity 524, and siren activities 526 prior torequesting the patient to push the response button in a patientnotification activity 522B and an alert activity 528B. The ambulatorymedical device controller delays the administration of therapy inresponse to the requested action (e.g., pushing the response button)being successfully completed by the patient. Next, the ambulatory devicecontroller requests that the patient release the response button via apatient notification activity 522C and an alert activity 528C betweenthe 25 and 30 second marks on the elapsed time sequence 514. The releaseof the response button at the 35 second mark on the elapsed timesequence occurs shortly after the ambulatory medical device controllerrequests the release of the response button. The device subsequentlydelays the administration of therapy 538 a period of time beforerepeating the process (e.g., beginning with a patient notificationactivity 522A and a vibrate activity 524). The length of the delay maybe based upon the detected health disorder of the patient. In someembodiments, the ambulatory medical device controller is configured todelay the administration of therapy 15 seconds for ventriculardefibrillation disorders and 30 seconds for ventricular tachycardiadisorders.

In scenario 500D of FIG. 5D, the cardiac rhythm of a patient iscontinuously monitored in an activity 516D. The ambulatory medicaldevice controller detects a cardiac arrhythmia event 518D. As shown inresponse button activity 520D on the response button sequence 506, theambulatory medical device controller detects that the response button isalready in the activated position when the arrhythmia is detected at theevent 518D. The ambulatory medical device controller subsequently issuesa patient notification activity 522C requesting the patient to releasethe response button. The patient notification activity 522C isaccompanied by siren activity 526 and a vibrate activity 524 followed byan audible alert activity 528C requesting the patient release theresponse button. In this scenario, the patient fails to response to theaudible and visual requests to release the response button, and theambulatory medical device controller consequently delivers therapy tothe patient using a similar sequence as previously described with regardto scenario 500A between the 25 and 55 second marks on the elapsedsequence 514 of FIG. 5A. It is appreciated that a second pulse may betransmitted if the arrhythmia continues and the patient fails to respondto additional requests from the ambulatory medical device controller.While the example scenarios disclosed herein recite specific treatmentsequences, the treatment sequences in each scenario may be alteredwithout departing from the scope of the embodiments disclosed herein.For example, the activated and deactivated states of the response buttonmay be interchanged.

It is appreciated that the treatment sequences described with referenceto the first mode of operation and FIGS. 5A-D are not limited toambulatory medical device controllers operating in the first mode ofoperation or ambulatory medical device controllers with multiple modesof operation. The treatment sequences may be applied to ambulatorymedical device controllers operating in any mode of operation (e.g., thesecond mode of operation described herein). In addition, the responsebutton may be replaced with one or more other response mechanisms. Otherpossible response mechanisms include, for example, a button on the touchscreen and patient voice recognition.

Example Patient Monitoring and Treatment Scenarios in a Second OperatingMode

Various embodiments implement and enable various scenarios through whichan ambulatory medical device controller operating in the secondoperating mode, such as the ambulatory medical device controller 100described above with reference to FIG. 1, administers therapy to apatient. In some embodiments, the second mode of operation allows thepatient to delay the administration of therapy in response to changingthe status of two or more response buttons.

In some embodiments, the ambulatory medical device controller detects anarrhythmia and requests the patient to depress two buttonssimultaneously. In these embodiments, the ambulatory medical devicecontroller delays administration of therapy responsive to the activationof two response buttons simultaneously or within a predetermined periodof time. The therapy may be delayed responsive to the patient activatingboth response buttons.

In an embodiment, the ambulatory medical device controller delays theadministration of therapy until the patient releases one or two of thebuttons. If the patient releases one or two of the response buttons, theambulatory medical device controller may request that the patient pushtwo response buttons again. Otherwise, the ambulatory medical devicecontroller may administer therapy to the patient.

It is appreciated that the treatment sequences described with referenceto the second operation mode may not be limited to ambulatory medicaldevice controllers operating in the second mode of operation orambulatory medical device controllers with multiple modes of operation.The treatment sequences may be applied to ambulatory medical devicecontrollers operating in any mode of operation (e.g., the first mode ofoperation). In addition, the response button may be replaced with one ormore other response mechanisms. Other possible response mechanismsinclude a button on the touch screen and patient voice recognition.

Having thus described several aspects of at least one embodiment of thisinvention, it is to be appreciated various alterations, modifications,and improvements will readily occur to those skilled in the art. Suchalterations, modifications, and improvements are intended to be part ofthis disclosure, and are intended to be within the scope of theinvention. Accordingly, the foregoing description and drawings are byway of example only.

What is claimed is:
 1. An ambulatory medical device capable ofdelivering therapy to a patient, the ambulatory medical devicecomprising: a controller for controlling the delivery of the therapy tothe patient, the controller including at least one processor coupledwith a memory; a user interface in wireless communication with thecontroller; a response mechanism having a state that is activated by oneresponse button disposed on the user interface; and a therapy managercomponent executable by the controller and configured to: detect aphysiological parameter having a value indicative of a cardiac disorderof the patient; notify the patient of impending therapy delivery inresponse to the detection of the physiological parameter; request thepatient to provide a first input to the ambulatory medical device viathe response mechanism; monitor the state of the response mechanism bydetecting activation of the one response button within at least onepredetermined time period; delay therapy delivery to the patient inresponse to detecting a change in the state of the response mechanism bythe activation of the one response button within the at least onepredetermined time period; monitor the state of the response mechanismfor a second predetermined time period; and request the patient toprovide a second input to the ambulatory medical device via the responsemechanism during the second predetermined time period.
 2. The ambulatorymedical device of claim 1, wherein the therapy manager component isfurther configured to: either further delay the therapy delivery inresponse to detection of the second input during the secondpredetermined time period or prepare to deliver the therapy to thepatient in response to not detecting the second input before expirationof the second predetermined time period.
 3. The ambulatory medicaldevice of claim 1, further comprising a touchscreen display disposed onthe user interface.
 4. The ambulatory medical device of claim 3, whereinthe response mechanism comprises a button displayed on the touch screenand the state of the response mechanism is activated when the patientinteracts with the button displayed on the touch screen.
 5. Theambulatory medical device of claim 4, wherein at least one of the firstinput and the second input is provided via the button displayed on thetouch screen.
 6. The ambulatory medical device of claim 1, wherein thetherapy manager component is configured to notify the patient via atleast one of audible, visual, and tactile output.
 7. The ambulatorymedical device of claim 1, wherein the cardiac disorder comprises atleast one of ventricular tachycardia, ventricular defibrillation,bradycardia, tachycardia, erratic heart rate, asystole, and pulselesselectrical activity.
 8. The ambulatory medical device of claim 1,wherein the therapy manager component is further configured to prepareto deliver the therapy to the patient by causing the ambulatory medicaldevice to apply gel to the patient.
 9. The ambulatory medical device ofclaim 1, wherein the therapy manager component is further configured togenerate at least one of siren activity and vibration activity toaccompany the request that the patient provide either or both the firstinput and the second input to the ambulatory medical device.
 10. Theambulatory medical device of claim 1, wherein the user interfacecomprises two response buttons and the response mechanism comprises astate that is activated by either one of the two response buttons. 11.The ambulatory medical device of claim 1, further comprising at leastone adhesive ECG sensing electrode coupled with the controller tomonitor a cardiac function of the patient.
 12. The ambulatory medicaldevice of claim 1, further comprising a vest, and at least one adhesiveECG sensing electrode attached to the vest and disposed adjacent atleast one location on a body of the patient.
 13. The ambulatory medicaldevice of claim 1, further comprising a first at least one ECG sensingelectrode disposed on a front of a torso of the patient and a second atleast one ECG sensing electrode disposed on a side of the torso of thepatient.
 14. The ambulatory medical device of claim 1, furthercomprising a plurality of physiological sensors including an ECGelectrode and at least one of a body temperature sensor, a respirationmonitor, and an acoustic sensor.
 15. A method for delivering therapy toa patient using an ambulatory medical device comprising: detecting, by acontroller of the ambulatory medical device, a physiological parameterhaving a value indicative of a cardiac disorder of the patient;notifying the patient of impending therapy delivery in response to thedetection of the physiological parameter; requesting the patient toprovide a first input to the ambulatory medical device via a responsemechanism having a state that is activated by one response button, theresponse mechanism being disposed on a user interface in wirelesscommunication with the controller; monitoring the state of the responsemechanism by detecting the activation of the one response button withinat least one predetermined time period; delaying therapy delivery to thepatient in response to detecting a change in the state of the responsemechanism by the activation of the one response button within the atleast one predetermined time period; monitoring the state of theresponse mechanism for a second predetermined time period; andrequesting the patient to provide a second input to the ambulatorymedical device via the response mechanism during the secondpredetermined time period.
 16. The method of claim 15, furthercomprising either further delaying the delivery of the therapy inresponse to detection of the second input during the secondpredetermined time period or preparing to deliver the therapy to thepatient in response to not detecting the second input before expirationof the second predetermined time period.
 17. An ambulatory medicaldevice capable of delivering therapy to a patient, the ambulatorymedical device comprising: a controller for controlling the delivery ofthe therapy to the patient, the controller including at least oneprocessor coupled with a memory; a garment configured to be worn on atorso of the patient; a plurality of therapy electrodes disposed on thegarment, coupled to the controller, and configured to deliver thetherapy to the patient; a plurality of ECG sensing electrodes disposedon the garment, coupled to the controller, and configured to monitor acardiac function of the patient; a user interface in wirelesscommunication with the controller; a response mechanism having a statethat is activated by one response button disposed on the user interface;and a therapy manager component executable by the controller andconfigured to: detect a physiological parameter having a valueindicative of a cardiac disorder of the patient; notify the patient ofimpending therapy delivery in response to the detection of thephysiological parameter; request the patient to provide a first input tothe ambulatory medical device via the response mechanism; monitor thestate of the response mechanism by detecting activation of the oneresponse button within at least one predetermined time period; delaytherapy delivery to the patient in response to detecting a change in thestate of the response mechanism by the activation of the one responsebutton within the at least one predetermined time period; monitor thestate of the response mechanism for a second predetermined time period;and request the patient to provide a second input to the ambulatorymedical device via the response mechanism during the secondpredetermined time period.
 18. The ambulatory medical device of claim17, wherein the user interface comprises two response buttons and theresponse mechanism comprises a state that is activated by either one ofthe two response buttons.
 19. The ambulatory medical device of claim 17,wherein a first at least one of the plurality of ECG sensing electrodesis disposed on a front of the torso of the patient, and a second atleast one of the plurality of ECG sensing electrodes is disposed on aside of the torso of the patient.
 20. The ambulatory medical device ofclaim 17, wherein the plurality of ECG sensing electrodes comprises along term wear adhesive electrode.